How can you find pairs of numbers in an array that sum up to a value less than a given number k?

Answer 1

To find pairs of numbers in an array that add up to a value less than a given number k, you can use a two-pointer approach. Sort the array first, then use two pointers - one starting from the beginning and the other from the end. Check the sum of the two numbers pointed by the pointers. If the sum is less than k, increment the left pointer to increase the sum. If the sum is greater than or equal to k, decrement the right pointer to decrease the sum. Repeat this process until the pointers meet or the sum is less than k.